AMD was a little too early in May with its monthly Catalyst driver release, with the Catalyst 11.5 WHQL reaching the web as early as 9th May (typically monthly Catalyst updates are released after the 24th). On the same date, AMD also released its first hotfix update for the Catalyst 11.5, the 11.5a Hotfix Update, which packed a number of game-specific performance improvements. Today, the company released its second such update for the month, with Catalyst 11.5b Hotfix.

The update is rushed in to fix a number of issues found with the recently-released game, Brink. It also fixes a number of non-gaming application issues, particularly related to media decoding. In the process, the driver also brings with it a number of game-specific performance improvements, games including Civilization 5, Dead Rising 2, Fallout 3, Mafia 2, NBA 2010, ShenGuiChuanQi, Starcraft 2, Warcraft III, World of Warcraft, and Dirt 3.